<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
         <!-- 卡片视图区域 -->
         <el-card>
             <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps"  v-model="addForm.goods_cat" @change="handleChange">
                    </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox  border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                    </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <el-upload :action="uploadURL" :on-preview="handlePreview" 
                    :on-remove="handleRemove" list-type="picture" :headers="headerObj" 
                    :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
                </el-tabs>
            </el-form>
         </el-card>  

         <!-- 图片弹出框      -->
         <el-dialog
            title="展示图片"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="img_path">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data(){
        return{
            queryInfo:{
                query:''
            },
            activeIndex:'0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                //图片的数组
                pics:[],
                //富文本数据
                goods_introduce:'',
                 attrs: []
            },
             catelist:[],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //设置请求头
            headerObj:{
                Authorization:window.sessionStorage.getItem("token")
            },
            //图片存放路径
            previewPath:'',
            //图片展示弹出框显示与隐藏
            previewVisible:false,
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            addFormRules: {
                    goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                    ],
                    goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                    ],
                    goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                    ],
                    goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                    ],
                    goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                    ]
                },
        }
    },
    created() {
        this.getCateList()
    },
    methods:{
        async getCateList(){
             const { data: res } = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类数据失败！')
                }
                this.catelist = res.data
               
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange() {
        
        if (this.addForm.goods_cat.length !== 3) {
            this.addForm.goods_cat = []
        }
        },
        addDialogClosed() {
        this.$refs.addFormRef.resetFields()
        },
         beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页名字是：' + oldActiveName)
            // console.log('即将进入的标签页名字是：' + activeName)
            // return false
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
      async tabClicked(){
          if (this.activeIndex=='1') {
            const {data:res}=   await this.$http.get(`categories/${this.cateId}/attributes`,{  params: { sel: 'many' }})
           
            if(res.meta.status!==200) return this.$message.error(res.meta.msg)
             res.data.forEach(item => {
                item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manyTableData=res.data
           }else if (this.activeIndex === '2') { 
            const { data: res } = await this.$http.get( `categories/${this.cateId}/attributes`, {params: { sel: 'only' } })
                if (res.meta.status !== 200) {
                return this.$message.error('获取静态属性失败！')
                }
               
                this.onlyTableData = res.data
            }
       },
       //图片预览事件
       handlePreview(file){
           const previewPath=file.response.data.url
           this.previewPath=previewPath
           this.previewVisible=true
       },
       //图片删除事件
       handleRemove(file){
          
            // 1. 找到临时路径
            const filePath = file.response.data.tmp_path
            // 2. 从 pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
            this.addForm.pics.splice(i, 1)
       },
       //发送图片成功的钩子函数
       handleSuccess(res) {
           const picInfo={pic:res.data.tmp_path}
           this.addForm.pics.push(picInfo)
          
       },
       //富文本区域确定事件
       add(){
           this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                return this.$message.error('请填写必要的表单项！')
                }
                const form= _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 动态参数数据

                this.manyTableData.forEach(item=>{
                    const newInfo={
                        attr_id:item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 静态属性数据
                
                this.onlyTableData.forEach(item=>{
                    const newInfo={
                        attr_id:item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                const { data: res } = await this.$http.post('goods', form)

                if (res.meta.status !== 201) {
                return this.$message.error(res.meta.msg)
                }

                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
       }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
                return null
            }
  }
}
</script>
<style lang="less" scoped>
    .img_path {
        width: 100%;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>

